Heat oven to 400 F. Toss bell pepper, onion, grape tomatoes, and garlic cloves with oil. Spread out on rimmed baking sheet and roast until bell pepper and tomatoes are softened and onion has darkened, about 25 minutes. In blender container, place roasted vegetables, sun-dried tomatoes, soaking liquid, 2 cups water, soy sauce, and paprika; blend until smooth.